Module types

Expand description

Storage types to build abstraction on storage, they implements storage traits such as StorageMap and others.

Structs§

CountedStorageMap: A wrapper around a StorageMap and a StorageValue (with the value being u32) to keep track of how many items are in a map, without needing to iterate all the values.
CountedStorageNMap: A wrapper around a StorageNMap and a StorageValue (with the value being u32) to keep track of how many items are in a map, without needing to iterate all the values.
Key: A type used exclusively by storage maps as their key type.
OptionQuery: Implements QueryKindTrait with Query type being Option<_>.
ResultQuery: Implements QueryKindTrait with Query type being Result<Value, PalletError>.
StorageDoubleMap: A type representing a double map in storage. This structure associates a pair of keys with a value of a specified type stored on-chain.
StorageMap: A type representing a map in storage. A storage map is a mapping of keys to values of a given type stored on-chain.
StorageNMap: A type representing an NMap in storage. This structure associates an arbitrary number of keys with a value of a specified type stored on-chain.
StorageValue: A type representing a value in storage. A storage value is a single value of a given type stored on-chain.
ValueQuery: Implements QueryKindTrait with Query type being Value.

CountedStorageMapInstance: The requirement for an instance of CountedStorageMap.
CountedStorageNMapInstance: The requirement for an instance of CountedStorageNMap.
EncodeLikeTuple: Marker trait to indicate that each element in the tuple encodes like the corresponding element in another tuple.
HasKeyPrefix: Trait indicating whether a KeyGenerator has the prefix P.
HasReversibleKeyPrefix: Trait indicating whether a ReversibleKeyGenerator has the prefix P.
KeyGenerator: A trait that contains the current key as an associated type.
KeyGeneratorMaxEncodedLen: The maximum length used by the key in storage.
QueryKindTrait: Trait implementing how the storage optional value is converted into the queried type.
ReversibleKeyGenerator: A trait that indicates the hashers for the keys generated are all reversible.
StorageEntryMetadataBuilder: Build the metadata of a storage.
TupleToEncodedIter: Trait to indicate that a tuple can be converted into an iterator of a vector of encoded bytes.